that is caused by your pcv valve....I have the same problem. I get it replaced and it is good for a couple of days and then it goes out again. It is a never ending cycle. The people at the dealership are stumped....they just keep replacing it. Do you hear a noise by your intake too??? Kinda like it is letting out steam or something???
mickey.....is it just me or does the care seem to have a little less power while it makes that noise and then seems normal when it is replaced and functioning correctly???